Ai Takahashi joined Morning Musume in 2001 as part of the group's fifth generation, along with Makoto Ogawa, Asami Konno, and Risa Niigaki. Her debut with the group was on their single "Mr. Moonlight: Ai no Big Band", and her first appearance on a Morning Musume full-length release was their fourth studio album, the appropriately named 4th Ikimasshoi!. Her first appearance within a Hello! Project shuffle unit release was on the 2002 single "Shiawase Beam! Suki Suki Beam!" under the group name Happy 7.